再问指代问题，prep 19

klhyy

19. Industrialization and modern methods of insect control have improved the standard of living around the globe while at the same time they have introduced some 100,000 dangerous chemical pollutants, having gone virtually unregulated since they were developed more than 50 years ago.

A. while at the same time they have introduced some 100,000 dangerous chemical pollutants, having

B. while at the same time introducing some 100,000 dangerous chemical pollutants that have
            

C. while they have introduced some 100,000 dangerous chemical pollutants at the same time, which have

D. but introducing some 100,000 dangerous chemical pollutants at the same time that have

E. but at the same time introducing some 100,000 dangerous chemical pollutants, having

对答案没有疑议，想请nn确认下，since they were developed more than 50 years ago. 中的they到底指代的是什么。

我的想法是since句从层次上来讲应该是 Industrialization and modern methods of insect control have improved ...的时间状语从句，因而they指代的是methods。while句之所以用省略形式，就是为了避免，在while they have introduced some 100,000 dangerous chemical pollutants...since 结构中，they可能指代pollutants的歧义。

不知道我有没有说清楚，请NN们帮我解惑！谢谢

xuyidan1210

我觉得THEY不可能指代POLLUTANTS吧。无论从逻辑还是语法，都是优先指代从句WHILE中出现的主语，也就是省略的THEY

klhyy

谢谢mm，顶起来，还是希望有NN来帮忙确认下。

喝咖啡的狼

 Industrialization and modern methods of insect control

rorarora

这道题我这么考虑，

while后面带的其实是从句：subordinate clause.附属于have improved....级别上弱于have improved....

而since实际上是修饰主句：have improved....., since.....所以they应该指代的是主句主语。

songlovegt

不同意楼上的解释

Industrialization and modern methods of insect control have improved the standard of living around the globe while at the same time introducing some 100,000 dangerous chemical pollutants that have gone virtually unregulated since they were developed more than 50 years ago.

如果为了明确修饰主句，Industrialization and modern methods of insect control have improved the standard of living around the globe
since 前面应该用逗号隔开，这样可以避免修饰歧义。
既然没有逗号，明确是修饰 chemical pollutants have gone virtually unregulated since they were developed more than 50 years.

songlovegt

另外如果 since they were developed more than 50 years ago. 是修饰主句的，离修饰对象也太远了，应该放在句首比较合适。

smartsky11

up

xiaoniuren

up

lijiahui0422

从逻辑意思上看 they 确实只能指代methods  说这些方法自50年前开始发展以来，既带来了好处又带来了坏处。


不过6楼说的有道理，since 从句放在句首的话最清楚还没歧义